pskewanglecorrection

Skew angle detection and correction.

Synopsis

pskewanglecorrection [-m mask] [rg1_in|-] [rg2_in|-]

Description

pskewanglecorrection detects and corrects the skew deviation in a document according to the writings orientation.

The mask of size width x height that is used to estimate the skew angle. This mask is extracted from the input image and represents the best tradeoff between density and number of black and white transitions in row. Then, the skew angle is determined by the angle which gives the higher maximum in the Wigner-Ville distribution of the horizontal distribution of the mask image.

Parameters

width, height are the size of the mask that is used to estimate the skew angle. This mask is extracted from the input image and represents the best trade-off between density and number of black and white transitions in row.
max_skew_angle is the maximum degree accepted for the correction.

Inputs

im1_in: a region map (segmented image).
im2_in: a region map (reference image/ ground truth).

Result

The skew angle value in degree.

Examples

pskewanglecorrection 70 100 10 page.pan a.pan

C++ prototype

Errc PSkewAngleCorrection( const Img2duc &rg1_in, const Img2duc &rg2_in, int width, int height, int max_angle );

Author: Régis Clouard